:root {
  color-scheme: light;
  --bg: #f5f7f9;
  --surface: #ffffff;
  --surface-soft: #f0f4f2;
  --line: #d8dee6;
  --text: #14201c;
  --muted: #617069;
  --green: #146b59;
  --green-strong: #0f5949;
  --blue: #315f9f;
  --coral: #c75c42;
  --coral-soft: rgba(199, 92, 66, 0.12);
  --selected: #fff8ed;
  --shadow: 0 18px 46px rgba(31, 45, 61, 0.12);
  --radius: 8px;
  --font-sans: "Inter", "Avenir Next", "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "Cascadia Mono", "SFMono-Regular", monospace;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  min-height: 100vh;
  color: var(--text);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.8), rgba(245, 247, 249, 0.96)),
    linear-gradient(135deg, #eef5f2 0%, #f7f8fb 52%, #eef3fb 100%);
  font-family: var(--font-sans);
}

button,
input,
select,
textarea {
  font: inherit;
}

code,
textarea,
.output {
  font-family: var(--font-mono);
}

button,
input,
select,
textarea {
  color: inherit;
}

.app-shell {
  width: min(1360px, calc(100vw - 32px));
  min-height: 100vh;
  margin: 0 auto;
  padding: 32px 0 44px;
}

.hero,
.controls-panel,
.panel {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.9);
  box-shadow: var(--shadow);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(320px, 0.85fr);
  gap: 24px;
  align-items: start;
  padding: 24px;
}

.hero__copy {
  min-width: 0;
}

.hero__side {
  display: grid;
  gap: 16px;
  justify-items: end;
  align-content: start;
}

.home-link {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  padding: 0 16px;
  border-radius: 999px;
  color: var(--green);
  background: rgba(20, 32, 28, 0.08);
  font-weight: 800;
  text-decoration: none;
  transition: transform 0.16s ease, background 0.16s ease, color 0.16s ease;
}

.home-link:hover,
.home-link:focus-visible {
  transform: translateY(-1px);
  color: var(--green-strong);
  background: rgba(20, 32, 28, 0.12);
}

.home-link:focus-visible,
.button:focus-visible,
.icon-card:focus-visible,
input:focus,
select:focus,
textarea:focus {
  outline: 3px solid rgba(49, 95, 159, 0.16);
  outline-offset: 2px;
}

.hero__eyebrow,
.panel__eyebrow {
  margin: 0 0 10px;
  color: var(--green);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero h1,
.panel h2,
.selected-section h3,
.hero__lead,
.panel__summary,
.feedback,
.preview-empty,
.selected-empty {
  margin: 0;
}

.hero h1 {
  max-width: 760px;
  font-size: 48px;
  line-height: 1.04;
  font-weight: 850;
  letter-spacing: 0;
}

.hero__lead {
  max-width: 680px;
  margin-top: 14px;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.75;
}

.hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  width: 100%;
}

.hero__card {
  min-width: 0;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.hero__label {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.hero__card strong {
  font-size: 28px;
  line-height: 1;
}

.controls-panel {
  display: grid;
  grid-template-columns: minmax(260px, 1.35fr) repeat(3, minmax(180px, 1fr));
  gap: 16px 18px;
  margin-top: 18px;
  padding: 18px;
}

.control-field {
  display: grid;
  gap: 10px;
}

.control-field--search {
  grid-column: 1 / span 1;
}

.control-field--perline {
  min-width: 0;
}

.control-field--toggle {
  align-content: start;
  gap: 12px;
}

.control-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: end;
}

.control-actions--stacked {
  align-items: start;
}

label {
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

input[type="search"],
input[type="text"],
input[type="number"],
select,
textarea {
  width: 100%;
  min-height: 44px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #ffffff;
  font-size: 14px;
  line-height: 1.5;
}

input[type="search"]:focus,
input[type="text"]:focus,
input[type="number"]:focus,
select:focus,
textarea:focus {
  border-color: rgba(49, 95, 159, 0.42);
}

textarea {
  resize: vertical;
}

.perline-inputs {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 90px;
  gap: 12px;
  align-items: center;
}

input[type="range"] {
  accent-color: var(--green);
}

.toggle {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 700;
}

.toggle input {
  width: 18px;
  height: 18px;
  margin: 0;
  accent-color: var(--green);
}

.button {
  appearance: none;
  min-height: 44px;
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 0 16px;
  background: var(--green);
  color: #ffffff;
  cursor: pointer;
  font-size: 14px;
  font-weight: 800;
  transition: transform 0.16s ease, background 0.16s ease, border-color 0.16s ease, color 0.16s ease;
}

.button:hover:not(:disabled) {
  transform: translateY(-1px);
  background: var(--green-strong);
}

.button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

.button--primary {
  background: var(--green);
}

.button--ghost {
  color: var(--text);
  background: rgba(20, 32, 28, 0.08);
}

.button--ghost:hover:not(:disabled) {
  background: rgba(20, 32, 28, 0.12);
}

.button--mini {
  min-height: 34px;
  padding: 0 12px;
  color: var(--green);
  background: rgba(20, 32, 28, 0.08);
  font-size: 12px;
}

.button--mini:hover:not(:disabled) {
  color: var(--green-strong);
  background: rgba(20, 32, 28, 0.12);
}

.workspace {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(360px, 0.92fr);
  gap: 18px;
  margin-top: 18px;
  align-items: start;
}

.panel {
  padding: 22px;
}

.panel--sticky {
  position: sticky;
  top: 20px;
}

.panel__header {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}

.panel h2 {
  font-size: 24px;
  line-height: 1.2;
  letter-spacing: 0;
}

.panel__summary {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.6;
}

.callout {
  margin-bottom: 16px;
  padding: 14px 16px;
  border-left: 4px solid var(--coral);
  border-radius: var(--radius);
  background: var(--coral-soft);
  color: #7d3f31;
  line-height: 1.6;
}

.feedback {
  min-height: 22px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.6;
}

.feedback.is-warning {
  color: #8b3d1e;
}

.feedback.is-success {
  color: var(--green);
}

.icon-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(132px, 1fr));
  gap: 12px;
}

.icon-card {
  position: relative;
  display: grid;
  gap: 10px;
  align-content: start;
  width: 100%;
  min-height: 158px;
  padding: 16px 14px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  cursor: pointer;
  text-align: left;
  transition: transform 0.16s ease, border-color 0.16s ease, box-shadow 0.16s ease, background 0.16s ease;
}

.icon-card:hover {
  transform: translateY(-2px);
  border-color: rgba(20, 107, 89, 0.34);
  box-shadow: 0 14px 32px rgba(31, 45, 61, 0.1);
}

.icon-card.is-selected {
  border-color: rgba(199, 92, 66, 0.42);
  background: var(--selected);
  box-shadow: inset 0 0 0 1px rgba(199, 92, 66, 0.08);
}

.icon-card img {
  width: 52px;
  height: 52px;
}

.icon-card__index {
  position: absolute;
  top: 10px;
  right: 10px;
  display: inline-flex;
  min-width: 28px;
  height: 28px;
  align-items: center;
  justify-content: center;
  padding: 0 8px;
  border-radius: 999px;
  background: rgba(20, 32, 28, 0.08);
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.icon-card.is-selected .icon-card__index {
  background: var(--coral-soft);
  color: #8b3d1e;
}

.icon-card__label {
  font-size: 15px;
  font-weight: 800;
}

.icon-card__id {
  color: var(--muted);
  font-size: 12px;
}

.preview-stack {
  display: grid;
  gap: 14px;
  margin-top: 18px;
}

.preview-card {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.preview-card__header,
.selected-section__header,
.output-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.preview-card__header {
  margin-bottom: 12px;
  font-size: 14px;
  font-weight: 800;
}

.preview-card__body {
  display: grid;
  min-height: 110px;
  place-items: center;
  padding: 18px;
  border: 1px solid rgba(216, 222, 230, 0.72);
  border-radius: var(--radius);
  background: var(--surface-soft);
}

.preview-card__body img {
  display: none;
  max-width: 100%;
}

.preview-card__body img.is-visible {
  display: block;
}

.preview-empty {
  color: var(--muted);
  font-size: 13px;
}

.selected-section {
  margin-top: 18px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.selected-list {
  display: grid;
  gap: 10px;
  margin-top: 14px;
}

.selected-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
  align-items: center;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #ffffff;
}

.selected-item__meta {
  display: grid;
  gap: 4px;
}

.selected-item__label {
  font-size: 14px;
  font-weight: 800;
}

.selected-item__id {
  color: var(--muted);
  font-size: 12px;
}

.selected-item__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.selected-item__actions button {
  min-width: 38px;
}

.selected-empty {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.6;
}

.output {
  background: rgba(248, 251, 249, 0.92);
}

.output--compact {
  min-height: 76px;
}

.toast {
  position: fixed;
  right: 18px;
  bottom: 18px;
  padding: 12px 16px;
  border-radius: var(--radius);
  background: rgba(20, 32, 28, 0.92);
  color: #ffffff;
  font-size: 13px;
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  transition: opacity 0.18s ease, transform 0.18s ease;
}

.toast.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 1120px) {
  .hero,
  .workspace {
    grid-template-columns: 1fr;
  }

  .hero__side {
    justify-items: start;
  }

  .controls-panel {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .control-field--search {
    grid-column: 1 / -1;
  }

  .panel--sticky {
    position: static;
  }
}

@media (max-width: 760px) {
  .app-shell {
    width: min(100% - 20px, 560px);
    padding: 14px 0 24px;
  }

  .hero,
  .controls-panel,
  .panel {
    padding: 18px;
  }

  .hero h1 {
    font-size: 36px;
  }

  .hero__stats,
  .controls-panel {
    grid-template-columns: 1fr;
  }

  .perline-inputs,
  .preview-card__header,
  .selected-section__header,
  .output-label {
    display: grid;
    grid-template-columns: 1fr;
  }

  .control-actions,
  .selected-item,
  .selected-item__actions {
    display: grid;
    grid-template-columns: 1fr;
  }

  .button,
  .home-link {
    width: 100%;
  }

  .toast {
    right: 10px;
    bottom: 10px;
    left: 10px;
    text-align: center;
  }
}